Finding the Fourth Proportional to 55,806.72, 83,697.12 and 20,762.88

Step by Step Solution

1. Step 1: Write the proportion equation
   55,806.72 : 83,697.12 = 20,762.88 : x
2. Step 2: Convert to fraction form
   55,806.72/83,697.12 = 20,762.88/x
3. Step 3: Cross multiply
   55,806.72x = 83,697.12 × 20,762.88
4. Step 4: Simplify right side
   55,806.72x = 1,737,793,258.91
5. Step 5: Solve for x
   x = 1,737,793,258.91/55,806.72
6. Step 6: Final answer
   x = 31,139.50